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Restrictions for Configuring the Half-Height Gigabit Ethernet Line Card

The following restrictions apply to the HHGE line card:

•It must be used with a PRE2 module.

•It must be placed only in slot 3 and slot 4 in the Cisco uBR10012 universal broadband router. Using slots 1 and slot 2 causes a conflict with the Timing, Communication, and Control Plus (TCC+) modules.

Information About the Half-Height Gigabit Ethernet Line Card

This section describes the Cisco Half-Height Gigabit Ethernet line card.

Benefits

The HHGE provides the following benefits to cable Multiple Service Operators (MSOs), service providers, and their partners and customers:

•Provides 1-port full- duplex 1-Gbps data rate

•Supports EtherChannel network

•Supports OIR for 1000BASE-SX or 1000BASE-LX GBICs, as described in the IEEE 802.3z specifications

•Provides redundant trunks in one chassis slot

•Increases throughput density and load balancing, which enhances high availability

•Supports trunk redundancy in a single slot, which frees up a slot for additional subscriber cards

Feature Overview

The HHGE line card (see Figure 1) contains a single Gigabit Ethernet port that provides a trunk uplink to switches and core routers. The HHGE line card provides the Cisco uBR10012 universal broadband router with an IEEE 802.3z- compliant Ethernet interface that can run up to 1 Gbps in full-duplex mode. The line card uses a small form-factor pluggable (SFP) GigaBit Interface Converter (GBIC) module and supports a variety of Gigabit Ethernet interface types (SX, LX/LH, and ZX), which you can change or upgrade at any time.

Faceplate and LEDs

Figure 1 Half-Height Gigabit Ethernet Line Card Faceplate

1

Ejector levers

4

SFP Gigabit Interface Converter

2

FAIL LED (yellow)

5

Link status LED (green)

3

Receive packet LED (green)

6

Transmit packet LED (green)

LEDs

This HHGE line card faceplate contains the following LEDs that continuously indicate line card status as well as the status of the port during operation (see Figure 1):

•FAIL (yellow)—This LED lights during portions of the POST (Power-On Self Test), but remains off after the POST on a properly working line card. If the line card fails during operation, this LED lights and an alarm event occurs.

The FAIL LED blinks during the following SFP GBIC faults:

–An SFP GBIC other than a Cisco brand is inserted.

–A non-Gigabit Ethernet SFP GBIC is inserted.

–A hardware problem occurs in a valid SFP GBIC.

•LINK (green)—When on, this LED indicates that a carrier signal exists. If negotiation is enabled (at both ends), it indicates successful completion and the port can pass traffic.

Note This LED can also be on if the line card is in internal loopback.

When off, this LED indicates that no carrier signal is detected, negotiation failed, or the port is administratively down.

•RX (green)—When on, this status LED indicates that packets are being received. When this LED is off, the line card is not receiving packets.

•TX (green)—When on, this status LED indicates that packets are being transmitted. When this LED is off, the line card is not transmitting packets.

Note Because this line card operates in full-duplex mode, both the RX and TX LEDs can be on at the same time.

•1000BASE-ZX SFP—The GLC-ZX-SM, 1000BASE-ZX SFP operates on ordinary single-mode fiber optic link spans of up to 70 kilometers (km) in length. Link spans of up to 100 km are possible using premium single-mode fiber or dispersion-shifted single-mode fiber. The SFP provides an optical link budget of 23 dB—the precise link span length depends on multiple factors such as fiber quality, number of splices, and connectors.

When shorter distances of single-mode fiber are used, it may be necessary to insert an inline optical attenuator in the link, to avoid overloading the receiver. A 5-decibel (dB) or 10-dB inline optical attenuator should be inserted between the fiber optic cable plant and the receiving port on the GLC-ZX-SM at each end of the link whenever the fiber optic cable span is less than 25 km.

•1000BASE-T SFP— Support for the GLC-T, 1000BASE-T SFP module was introduced in Cisco IOS Release 12.3(23)BC1.

Note The required line card SFP GBIC is shipped already installed in the line card. Cisco sells individual SFP GBICs separately and you can change the type of Gigabit Ethernet interface supported by this line card by simply changing its SFP GBIC.

1A mode-conditioning patch cord is required. Using an ordinary patch cord with MMF, 1000BASE-LX/LH SFP modules, and a short link distance (ten meters) can cause transceiver saturation resulting in an elevated bit error rate (BER). In addition, when using the LX/LH SFP module with 62.5-micron diameter MMF, you must install a mode-conditioning patch cord between the SFP module and the MMF cable on both the transmit and receive ends of the link. The mode-conditioning patch cord is required for link distances greater than 984 ft (300 m).

2The 1000BASE-ZX SFP module can reach up to 100 km by using dispersion-shifted SMF or low attenuation SMF; the distance depends on fiber quality, number of splices, and connectors.

Gigabit Ethernet Line Card Default Values

Table 2 lists default values for the Gigabit Ethernetline cards. Table 2 includes the command used for modifying a default value and indicates if a value needs to be the same (or opposite) on the remote end of the connection.

Table 2 Gigabit Ethernet Line Card Defaults

Command Name

Default Setting

Command Syntax

Remote Side Setting

auto-negotiation

Enabled

[no] negotiation auto

Same

mtu

1500 (half-height)

mtu [bytes]

Same

Half-Height Gigabit Ethernet Line Card Syntax

To specify an interface number in a configuration command, use the syntax in Table 3 to identify interfaces on the HHGE line cards.

Table 3 HHGE Interface Syntax

Card

Slot

Subslot

Port

HHGE

3 and 4

0 and 1

0

The following example shows the syntax for configuring an HHGE line card in slot 3:

Router(config)# interface GigabitEthernet 3/0/0

How to Configure the Half-Height Gigabit Ethernet Line Card

The following sections describe configuration commands used for configuring the HHGE line card.

Configuring the Interface

Use the following procedure to create a basic configuration (enabling an interface and specifying IP routing) for a Gigabit Ethernet interface. Be prepared with the information you need, such as the interface IP address.

Example

The following example defines the initial steps for configuring the HHGE interface:

Router# configure terminal

Router(config)# interface gigabitethernet 3/0/0

Router(config-if)# ip address 192.168.172.12 255.255.255.0

Router(config-if)# end

Enabling Auto-Negotiation

To set auto-negotiation mode for a Gigabit Ethernet interface, use the negotiation auto command.

To remove auto-negotiation, use the no form of the command.

Selecting the no negotiation auto command causes the interface to enter a state called force-link-up.

Prerequisites

None

Restrictions

None

SUMMARY STEPS

1. enable

2. configureterminal

3. interfacegigabitethernet [slot/subslot/port]

4. negotiation auto

5. end

DETAILED STEPS

Command or Action

Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2

configureterminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

interface gigabitethernet [slot/subslot/port]

Example:

Router(config)# interface gigabitethernet 3/0/0

Selects the slot, subslot, and port to configure, and enters interface configuration mode.

Step 4

negotiation auto

Example:

router(config-if)# negotiation auto

Selects auto-negotiation.

If necessary, modify the HHGE line card configuration or that of the remote device to ensure that, where appropriate, they use the same settings. For more information, refer to Table 2.

Step 5

end

Example:

Router(config-if)# end

Exits the configuration mode.

Example

The following example defines auto-negotiation mode for a Gigabit Ethernet interface:

Router# configure terminal

Router(config)# interface gigabitethernet 3/0/0

Router(config-if)# negotiation auto

Router(config-if)# end

Assigning a MAC Address

Use the mac-address command to preserve a MAC address when you move a line card to a new slot or chassis. You may want to preserve the MAC address if you have an access list that refers to it. If you use this command, you should change the address on the original slot so that you do not have two slots with the same address.

To assign a user- defined MAC address for a Gigabit Ethernet interface, use the mac-address command. To remove the user-defined MAC address, use the no form of the command.

mac-address address

The address variable is a two-byte hexadecimal value.

Prerequisites

None

Restrictions

None

SUMMARY STEPS

1. configureterminal

2. interface gigabitethernet [slot/subslot/port]

3. mac-address address

4. end

DETAILED STEPS

Command or Action

Purpose

Step 1

configureterminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 2

interface gigabitethernet [slot/subslot/port]

Example:

Router(config)# interface gigabitethernet 3/0/0

Defines the slot address where the MAC is applied.

Step 3

mac-addressaddress

Example:

Router(config-if)# mac-address 6000.0001.0003

Defines the MAC address.

Step 4

end

Example:

Router(config-if)# end

Exits the configuration mode.

Example

The following example defines a MAC address for a Gigabit Ethernet interface:

Router# configure terminal

Router(config)# interface gigabitethernet 3/0/0

Router(config-if)# mac-address 6000.0001.0003

Router(config-if)# end

Setting and Changing Loopback Mode

To set loopback mode for a Gigabit Ethernet interface, use the loopback command. To remove loopback mode, use the no form of the command.

loopback [internal | external

Where:

•external runs a loopback that requires a loopback connector.

•internal runs a loopback at the MAC controller.

Prerequisites

None

Restrictions

None

SUMMARY STEPS

1. configureterminal

2. interface gigabitethernet[slot/subslot/port]

3. loopback [internal | external]

4. end

DETAILED STEPS

Command or Action

Purpose

Step 1

configureterminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 2

interface gigabitethernet [slot/subslot/port]

Example:

Router(config)# interface gigabitethernet 3/0/0

Enters interface configuration mode.

Step 3

loopback [internal | external]

Example:

Router(config-if)# loopback internal

Sets loopback mode for the interface, where:

•internal runs a loopback at the MAC controller.

•external runs a loopback that requires a loopback connector.

Step 4

end

Example:

Router(config-if)# end

Exits the configuration mode.

Example

The following example defines an internal loopback mode for a Gigabit Ethernet interface:

Router# configure terminal

Router(config)# interface gigabitethernet 3/0/0

Router(config-if)# loopback internal

Router(config-if)# end

Enabling IEEE 802.1Q Encapsulation

To enable IEEE 802.1Q encapsulation of traffic on a Gigabit Ethernet interface, use the encapsulation dot1q command. To remove IEEE 802.1Q encapsulation, use the no form of the command.

encapsulation dot1q vlan-id

Prerequisites

None

Restrictions

None

SUMMARY STEPS

1. configureterminal

2. interface gigabitethernet[slot/subslot/port]

3. encapsulation dot1q vlan-id

4. end

DETAILED STEPS

Command or Action

Purpose

Step 1

configureterminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 2

interface gigabitethernet [slot/subslot/port]

Example:

Router(config)# interface gigabitethernet 3/0/0

Enters interface configuration mode.

Step 3

encapsulation dot1q vlan-id

Example:

Router(config-if)# encapsulation dot1q 101

Enables IEEE 802.1Q encapsulation of traffic onthe interface, where:

•vlan-id is VLAN identifier. Range is 1 to 1000.

Step 4

end

Example:

Router(config-if)# end

Exits the configuration mode.

Example

The following example encapsulates VLAN traffic using the IEEE 802.1Q protocol for VLAN 101 on an HHGE interface:

Router# configure terminal

Router(config)# interface gigabitethernet 3/0/0

Router(config-if)# encapsulation dot1q 101

Router(config-if)# end

Setting the Maximum Transmission Unit

To adjust the maximum transmission unit (MTU) size on a Gigabit Ethernet interface, use the mtu command. Use the no form of this command to restore the MTU value to its original default value of 1500.

mtu [bytes]

Prerequisites

None

Restrictions

None

SUMMARY STEPS

1. configureterminal

2. interface gigabitethernet[slot/subslot/port]

3. mtu [bytes]

4. end

DETAILED STEPS

Command or Action

Purpose

Step 1

configureterminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 2

interface gigabitethernet [slot/subslot/port]

Example:

Router(config)# interface gigabitethernet3/0/0

Enters interface configuration mode.

Step 3

mtu [bytes]

Example:

Router(config-if)# mtu 4470

Sets maximum transmission unit (MTU), where:

•bytes specifies the size in bytes. Range is 1500 to 4470.

If necessary, modify the HHGE line card configuration or that of the remote device to ensure that, where appropriate, they use the same settings. For more information, refer to Table 2.

Step 4

end

Example:

Router(config-if)# end

Exits the configuration mode.

Example

The following example sets the MTU to 4470 on a Gigabit Ethernet interface:

RFCs

Command Reference

This feature uses no new or modified commands.

Obtaining Documentation and Submitting a Service Request

For information on obtaining documentation, submitting a service request, and gathering additional information, see the monthly What's New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at:

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This document is to be used in conjunction with the documents listed in the Additional References section.

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